On Tue, May 24, 2011 at 02:11:20PM -0300, Marcelo Tosatti wrote:
>
> Commit fa4491a6b667304 moved the permission check for io instructions
> to the ->check_perm callback. It failed to copy the port value from RDX
> register for string and "in,out ax,dx" instructions. Fix it.
>
> Fixes FC8.32 installation.
>
> Signed-off-by: Marcelo Tosatti <[email protected]>
>
> diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
> index 3bc6b7a..df354a4 100644
> --- a/arch/x86/kvm/emulate.c
> +++ b/arch/x86/kvm/emulate.c
> @@ -2944,6 +2944,15 @@ static int check_perm_in(struct x86_emulate_ctxt *ctxt)
> {
> struct decode_cache *c = &ctxt->decode;
>
> + switch (c->b) {
> + case 0x6c: /* insb */
> + case 0x6d: /* insw/insd */
> + case 0xec: /* in al,dx */
> + case 0xed: /* in (e/r)ax,dx */
> + c->src.val = c->regs[VCPU_REGS_RDX];
> + break;
> + }
> +
> c->dst.bytes = min(c->dst.bytes, 4u);
> if (!emulator_io_permited(ctxt, c->src.val, c->dst.bytes))
> return emulate_gp(ctxt, 0);
> @@ -2955,6 +2964,15 @@ static int check_perm_out(struct x86_emulate_ctxt
> *ctxt)
> {
> struct decode_cache *c = &ctxt->decode;
>
> + switch (c->b) {
> + case 0x6e: /* outsb */
> + case 0x6f: /* outsw/outsd */
> + case 0xee: /* out dx,al */
> + case 0xef: /* out dx,(e/r)ax */
> + c->dst.val = c->regs[VCPU_REGS_RDX];
> + break;
> + }
> +
> c->src.bytes = min(c->src.bytes, 4u);
> if (!emulator_io_permited(ctxt, c->dst.val, c->src.bytes))
> return emulate_gp(ctxt, 0);
I'd rather do it at decoding stage by adding SrcDX/DstDX.
--
Gleb.
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